Zonneschijn — 2025
| Month | Castricum | Heemskerk | Difference |
|---|---|---|---|
| Jan | 103 uren | – | – |
| Feb | 141.4 uren | – | – |
| Mar | 312.3 uren | – | – |
| Apr | 321.1 uren | – | – |
| May | 377.4 uren | – | – |
| Jun | 404.9 uren | – | – |
| Jul | 403.6 uren | – | – |
| Aug | 345.5 uren | – | – |
| Sep |
| 269.6 uren |
| – |
| – |
| Oct | 163.6 uren | – | – |
| Nov | 131.6 uren | – | – |
| Dec | 98.4 uren | – | – |